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SAA7173
Integrating high-quality, multi-standard TV video (NTSC, PAL, and SECAM) and TV stereo (BTSC with dbx, SAP, and EIAJ) decoding, the Philips SAA7173 gives designers an efficient, low-BOM solution for adding analog TV features to a variety of computing and consumer products.
Analog TV video and stereo decoder for computing and consumer applications in North America and Japan
Semiconductors
On a single chip, the SAA7173 TV video/stereo decoder handles fully automatic detection and decoding of all worldwide analog TV video standards and the TV stereo formats used in North America and Japan. It delivers exceptional picture quality and advanced video features: low-noise, high-quality ADCs, an adaptive comb filter, subpixel-accurate scaling, and certified three-level Macrovision detection circuitry. The SAA7173's flexible design, reusable components, and versatile external interfaces lower BOM and cost and support advanced TV decoder configurations.
Target applications
The SAA7173 is a space-efficient solution for adding high-quality multi-standard analog TV decoding to a wide variety of computing and consumer products. Its 100% pin compatibility with the Philips SAA7174 decoder enables efficient reuse of SAA7174 designs.The SAA7173 is targeted for products in North American and Japanese (with time shifting), hybrid (analog/digital) TVs and cable, terrestrial, and satellite set-top boxes, USB/1394 video dongles, DVD recorders, and more. markets such as desktop and portable PCs, personal video recorders
Key features
> Fully automatic detection and decoding of worldwide analog TV video formats: PAL, NTSC, and SECAM > Automatic standard detection and decoding of TV stereo formats: BTSC (with dbxTM noise reduction), SAP, EIAJ, and FM radio
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> Supports simultaneous stereo decoding and adaptive 3D comb filtering to enhance picture quality
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> Certified three-level Macrovision(R) detection circuitry
> Advanced audio feature processing: volume, balance, bass, treble, automatic volume leveling (AVL), and Philips Incredible Sound > Captures raw VBI data (for Closed Captioning,Teletext, etc.) > Superior subpixel-accurate horizontal and vertical scaling > Outputs digital I2S audio and ITU-656 video
at aS
CVBS
SIF
w
VGA TV CARD
antenna or cable
TV TUNER MEMORY
.D
I2 C ITU/VIP I2S
GRAPHICS CONTROLLER
CVBS S-Video audio audio line-in
SAA7173
AGP bus
he
stereo audio (to sound card)
et 4U .c
Typical SAA7173 configuration for an analog VGA TV add-in card
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www..com
SAA7173
Analog TV video and stereo decoder for computing and consumer applications in North America and Japan
Semiconductors
Analog TV video capture and decoding
Analog video is sampled through five video inputs, supporting any combination of CVBS and S-Video signals from TV tuners and devices such as analog VCRs and camcorders. The SAA7173 automatically detects 50- and 60-Hz field frequencies and all analog TV video standards (PAL, NTSC, and SECAM). Video is digitized by sophisticated, low-noise, nine-bit ADCs with built-in white and color peak control, clamping, and programmable gain control. Support for 27-MHz oversampling, twice the ITU-601 standard, ensures an exceptional signal-to-noise ratio for maximum picture clarity. Additional features include single crystal support for all video standards, ultra-fast frame lock (for fast input-switching in surveillance applications and VCR fast search, shuttle, and freeze frame), and forced-field toggle (for non-interlaced inputs to avoid VCR `blue screen'). The SAA7173 decodes composite video into ITU-601-compatible component color values. Its high-quality, multi-standard, adaptive four-line comb filter performs best-in-class luma/chroma separation of CVBS signals from all sources, significantly reducing dot crawl and enhancing image resolution and detail.The decoder integrates separate brightness-contrast-saturation circuitry for CVBS, S-Video, and raw VBI samples and hue control for CVBS and S-Video signals.
The SAA7173 supports fully automatic, three-level hardware Macrovision detection with active-status interrupt. By ensuring the content's original analog copy protection is still intact, Macrovision prevents unauthorized recording of copyrighted material transmitted through analog video outputs in applications such as time-shift or archive recording or large screen display.
Video scaling, matrix, clipping
The SAA7173 incorporates an adaptive filter and circuitry to crop, scale, and reduce frame rate. It can perform horizontal or vertical video down scaling or zooming to support playback windows of any size.Two alternating settings for active video scaling support independent capture and preview definition. Adaptive anti-alias filters reduce board space, system costs, and external components. Optional YUV-to-RGB and RGB-to-YUV matrices and a color lookup table can be used to normalize ITU-standard color values to the full RGB range and apply gamma correction as needed to optimize screen contrast and color.
Video output
Decoded, scaled video is output through a digital video output port in various YUV or RGB formats, including packed and planar, gamma-compensated, or black-stretched.
USB TV DONGLE
antenna or cable
TV TUNER MEMORY
VBI capture
The SAA7173 captures raw VBI samples to memory, making them available to software components for decoding.The VBI sampling
I2C
CVBS
SIF
rate can be adjusted as needed by the data slicing software.
MPEG-2 ENCODER
CVBS S-Video audio audio line-in
SAA7173
ITU/VIP I2S
USB BUS
Supported VBI formats include Closed Captioning,Teletext,WST, NABST, CGMS, and WSS.
Typical SAA7173 configuration for an USB dongle add-in card
SAA7173 conceptual block diagram
SAA7173
analog audio pass-through
ADC(2) DAC (2) AUDIO MUX
two analog audio stereo pairs
ANALOG AUDIO INTERFACE
32 kHz, 44.1 kHz, 48 kHz
analog stereo (to loopback cable or headphones) digital audio
AUDIO FEATURE PROCESSING
TV sound (SIF)
ANALOG SIF/ AUDIO INTERFACE
SOUND DECODER (BTSC+dbx, EIAJ, FM,AM)
ADC
(bass, treble, volume, balance, AVL, Philips Incredible Sound)
I2S
five analog video inputs: CVBS, S-Video
ANALOG VIDEO INTERFACE
ADC(2)
DECODER COMB FILTER
VIDEO SCALER
MATRIX & GAMMA VIDEO PORT FORMAT
CLOCK SYNC
digital video control data, config data from EEPROM
GPIO interrupt
PROGRAMMABLE I/O IRQ SELECTION/MAP
PROGRAMMING REGISTERS
I2C INTERFACE
I2 C
Stereo capture, decoding, and output
The SAA7173 handles capture and on-chip decoding of stereo formats used in North American (BTSC with dbx noise reduction and SAP) and Japanese (EIAJ) TV broadcasts. After capture from the TV tuner through a Sound Intermediate Frequency (SIF) port, TV stereo is digitized and FM or AM demodulated.The audio standard is automatically detected, the pilot tone is investigated (mono, stereo, dual), and the signal is decoded. Two 16-bit audio ADCs support capture of audio signals from nonstandard sources such as video cameras,VCRs, and AM (mono) or FM (stereo) radio through two stereo line-in inputs. An analog audio pass-through enables an incoming signal to be rerouted without processing and output through an external loop-back cable to a sound card. A field-locked audio clock samples a constant number of audio clocks per video field, guaranteeing synchronization of audio and video streams.
Advanced audio feature processing
The SAA7173 incorporates advanced on-chip audio feature processing to improve user control and perceived audio quality. Philips Incredible MonoTM adds stereo-like sound impression to monaural audio signals. Philips Incredible StereoTM widens the stereo image, immersing the listener in the screen action. Additional on-chip audio features include volume, balance, bass/ treble controls, and automatic volume leveling (AVL).
Versatile external interface
The SAA7173's flexible design, reusable components, and versatile external interfaces lower BOM and cost and support advanced decoder configurations. Such flexibility is made possible, in part, through 28 general purpose I/O (GPIO) pins, initially dedicated to provide a digital video port, an I2S digital audio output port, and peripheral interrupt input. GPIO pins can be reassigned if dedicated functions are not
Decoded digital audio is output through an I2S port or can be reconverted to analog (by on-chip stereo DACs) and rerouted through a loop-back cable to a sound card.
needed in a specific product configuration. In addition, unassigned pins can be utilized for GPIO under direct software control.
audio loop-back
mono
FM-radio
SAA7173 SAA7174
* *
*
*
*
A2/ Dual-FM
NICAM
BTSC (+ dbx)
SAP
*
*
EIAJ Incredible Mono Incredible Stereo
*
*
*
*
SAA717x family audio feature comparison
SAA7173
Analog TV video and stereo decoder for computing and consumer applications in North America and Japan
www.semiconductors.philips.com
Technical specifications
PHYSICAL Package Power Temperature Rectangular LQFP128; 128 pins supply 3.3 V consumption 1.35 W (typical application) 0 to 70 oC AUDIO SUBSYSTEM (CONT.) Clocks Selectable: 768*fs, 512*fs, 384*fs or 256*fs 24.576 MHz to external audio reference clock Locked to video frame rate ADCs Two (2) 16-bit baseband audio One (1) 8-bit SIF, 24.576 MHz Audio features Volume, balance, bass, treble, AVL, Philips Incredible Stereo, Philips Incredible Mono GENERAL PURPOSE I/O Total pins 28 Dedicated Digital video output, peripheral interrupts, two (2) I2S ports I 2 C INTERFACE Modes Bus-master interface, multi-master capable Slave interface Power 3.3 V and 5 V signal-level compatible Includes peripheral reset and power-down control Rates 100 kHz and 400 kHz
ANALOG VIDEO SUBSYSTEM Input Five (5) analog input ports supporting any combination of CVBS (NTSC, PAL, SECAM) or S-Video signals ADCs Two (2) 9-bit CMOS ADCs, 27-MHz oversampling Output digital video port (GPIO) ITU-656, YUV-VMI (8-bit), VIP 1.1 or VIP 2.0 (8- or 16-bit), ZV (16-bit), ITU-601 (16-bit) Sample rate 720 pixels/line (ITU 601) XTAL reference 32.11 or 24.576 MHz, supports all video standards Comb filter NTSC/PAL adaptive 4-line Y-C separation for all sources including broadcast and VCR Scaling Downscaling: horizontal, vertical, and by field rate Scalable from 10 taps H (for ratios close to 1:1) to 74 taps (icon-sized video) VBI formats Closed Captioning, Teletext, NABST, CGMS, WST, WSS Macrovision 3-level with active status interrupt; complies with Macrovision's Copy Protection Detect Specification, Revision 1.00 AUDIO SUBSYSTEM Input One (1) analog SIF port Two pairs (2) analog stereo baseband inputs Output analog One (1) analog stereo port (for loop-back to sound card or local headphones) digital Up to four (4) channels through two (2) I2S ports Decode formats BTSC (with dbx noise reduction), SAP, EIAJ Sample rates 32 kHz, 44.1 kHz, 48 kHz
Philips Semiconductors
Philips Semiconductors is a worldwide company with over 100 sales offices in more than 50 countries. For a complete up-to-date list of our sales offices please e-mail sales.addresses@www.semiconductors.philips.com. A complete list will be sent to you automatically.You can also visit our website http://www.semiconductors.philips.com/sales.
(c) Koninklijke Philips Electronics N.V. 2003 SCL 76
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Date of release: June 2003 document order number: 9397 750 11474 Published in USA

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